THE ALEUTIAN EARTHQUAKE OF JUNE 10, 1996 (MW 7.9) RUPTURED PARTS OF BOTH THE ANDREANOF AND DELAROF SEGMENTS

The epicenter of the Aleutian earthquake of June 10, 1996, is located in the Delarof segment where a large subduction earthquake is expected . However, the aftershock area of the earthquake is not only in the De larof segment but also in the Andreanof segment where the 1986 Andrean of earthquake occurred previously. We estimate the fault parameters of the 1996 earthquake by numerically computing the tsunami and comparin g the waveforms with that recorded at Adak. The fault width is 30 km o r less, and the average slip is about 4 m. The observed far-field tsun amis around the Pacific are also explained by the synthetic tsunami co mputed using the above fault parameters. The results indicate that the 1996 earthquake ruptured parts of both the Delarof and Andreanof segm ents. However, the 1996 earthquake did not rupture the region of the l argest moment release by the 1986 earthquake.